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Dreams might be random brain noise
Freud and Jung
Freud held that dreams conceal: a dream is the living out of a repressed desire that can't be acted on in regular life, probably a sexual one. Carl Jung agreed in part, but he saw dreams as a person reflecting on themselves and working through problems. In his view dreams reveal, using mythic archetypes as an ancient, basic language any human can understand. The very idea that dreams are symbolic and trying to tell us something is Freud's influence still at work.
Activation synthesis
In the late 1970s, Alan Hobson and Robert McCarley proposed the activation synthesis hypothesis: dreams are random bits of information from neurons firing in REM sleep, and the forebrain struggles to put them together into a narrative. They pointed to illogical content, odd sensory experiences, intense emotions, acceptance of strange events, and difficulty remembering. It was controversial because it removed the meaning from dreams, and it didn't explain why people dream.
Reverse learning and others
Francis Crick answered that dreaming can be explained without symbolism. He called it reverse learning: the brain sorts through the day's inputs, discarding some and turning others into memories. Other researchers suggest that dreams process emotions, clear mental clutter, promote creativity, or work as a dress rehearsal for something frightening, like a big interview the next day.
How did Freud read hidden desires in dreams?
Freud's The Interpretation of Dreams appeared in 1899, with 1900 printed on its title page. He split every dream into its manifest content, the story the dreamer remembers, and its latent content, the hidden wish behind it. He argued that a mental censor disguises the wish through condensation, which merges several people or images into one, and displacement, which shifts emotion onto something harmless. He called dreams the royal road to the unconscious.
How did Jung's archetypes differ from Freud's symbols?
Jung proposed that beneath each person's private unconscious lies a collective unconscious shared by all humans. Its contents, which he called archetypes, include figures such as the shadow, the anima and animus, and the wise old man. Jung read dream images as drawn from this shared layer, which Freud's theory did not include. The two men broke with each other around 1913.
What did Crick mean by reverse learning?
Francis Crick and Graeme Mitchison proposed the idea in a 1983 paper in Nature titled The function of dream sleep. They suggested that the cortex, which stores memories in dense networks of connections, can pick up false and parasitic patterns, and that REM sleep erases them. Their shorthand was that we dream in order to forget. Crick had shared the 1962 Nobel Prize in Physiology or Medicine for the structure of DNA.
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